In other words, Routers will not allow a broadcast from one LAN to cross the Router and reach another Network Segment. The primary function of a Router is to divide a big Broadcast domain to Multiple smaller Broadcast domain. Example: ARP Request message, DHCP DISCOVER Message ...
- Now local DHCP relay forwards a unicast DISCOVER packet to the DHCP server. When it receives the expected UNICAST OFFER response from DHCP server, it is supposed to change the bootp flag as broadcast and set the Broadcast IP as well in this OFFER packet. When this issue is present, the...
单播(unicast)帧(一对一):收到的帧的 MAC 地址与本站的硬件地址相同 广播(broadcast)帧(一对全体):发送给本局域网上所有站点的帧 多播(multicast)帧(一对多):发送给本局域网上一部分站点的帧网络层IP(Internet Protocol,网际协议)是为计算机网络相互连接进行通信而设计的协议。 ARP(Address Resolution Protocol,地...
Information carried in a DHCPDISCOVER message includes the client's MAC address (chaddr field), parameter request list (Option 55), and broadcast flag (flags field). Stage 2: Offer stage All the DHCP servers on the same network segment as the DHCP client receive the DHCPDISCOVER message. ...
39311 bytes Unicast: 491, Multicast: 19 Broadcast: 37, Jumbo: 0 Discard: 0, Total Error: 0 CRC: 0, Giants: 0 Jabbers: 0, Throttles: 0 Runts: 0 Output: 600 packets, 49436 bytes Unicast: 599, Multicast: 0 Broadcast: 1, Jumbo: 0 Discard: 0, Total Error: 0 Collisions: 0, Exce...
In the following figure, authorized and unauthorized DHCP servers can receive DHCP Discover messages broadcast by DHCP clients. DHCP client sending DHCP Discover messages If a bogus DHCP server sends a bogus DHCP Reply message with an incorrect gateway address, Domain Name System (DNS) server addres...
Run auto-port-defend protocol { all | { arp-request | arp-request-uc | arp-reply | dhcp | icmp | igmp | ip-fragment | nd} * } The protocols to which port attack defense is applied are specified. By default, port attack defense is applicable to ARP Request, U...
Within the broadcast domain, both Host_2 and Host_3 receive the ARP Request packet. Host_3, recognizing its IP address as the destination, updates its ARP table with the source IP and MAC addresses from the ARP Request packet. Subsequently, Host_3 unicast an ARP Reply packet to Host_1....
单播(unicast)帧(一对一):收到的帧的 MAC 地址与本站的硬件地址相同 广播(broadcast)帧(一对全体):发送给本局域网上所有站点的帧 多播(multicast)帧(一对多):发送给本局域网上一部分站点的帧网络层IP(Internet Protocol,网际协议)是为计算机网络相互连接进行通信而设计的协议。 ARP(Address Resolution Protocol,地...
Discovery Phase: When a DHCP client broadcasts a DHCP Discover message, the DHCP relay agent forwards this message to the DHCP server or the next-hop relay agent using unicast, after routing it accordingly. Offer Phase: The DHCP server determines an address pool based on the Giaddr field in...